CN105554597A - Strip-shaped loudspeaker box with mirror image type low-frequency radiators - Google Patents
Strip-shaped loudspeaker box with mirror image type low-frequency radiators Download PDFInfo
- Publication number
- CN105554597A CN105554597A CN201610120857.6A CN201610120857A CN105554597A CN 105554597 A CN105554597 A CN 105554597A CN 201610120857 A CN201610120857 A CN 201610120857A CN 105554597 A CN105554597 A CN 105554597A
- Authority
- CN
- China
- Prior art keywords
- low frequency
- frequency radiation
- radiation device
- loudspeaker
- casing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/021—Casings; Cabinets ; Supports therefor; Mountings therein incorporating only one transducer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
- H04R2201/028—Structural combinations of loudspeakers with built-in power amplifiers, e.g. in the same acoustic enclosure
Abstract
The invention relates to a strip-shaped loudspeaker box with mirror image type low-frequency radiators. A box body is in a long flat strip shape. Low-frequency radiator installation holes symmetrical in position are formed in the upper and lower surfaces of the right half part, in the long axis direction, of the box body respectively, and the two low-frequency radiators are correspondingly installed in the two upper and lower low-frequency radiator installation holes in a mirror symmetry mode. A mid-low-pitch loudspeaker installation hole is formed in the left half part, in the long axis direction, of the box body, a mid-low-pitch loudspeaker is installed in the mid-low-pitch loudspeaker installation hole, and the mid-low-sound loudspeaker radiates sounds towards the part over the box body. A high-pitch loudspeaker installation table is arranged on the front side face of the left end, in the long axis direction, of the box body, a high-pitch loudspeaker is installed on the high-pitch loudspeaker installation table, and the high-pitch loudspeaker radiates sounds towards the part right ahead of the box body. The strip-shaped loudspeaker box has the acoustic properties of being small in distortion, good in low frequency, capable of bearing high power and excellent in high-frequency performance; the transient stability of the loudspeaker box can be improved, and thus the loudspeaker box can achieve a good sound effect when radiating low-frequency sounds.
Description
Technical field
The present invention relates to a kind of loudspeaker acoustic enclosure, specifically a kind of mirror type low frequency radiation device bar shaped audio amplifier being suitable for that the audio & video equipments such as panel TV set use, belongs to electroacoustic equipment technical field.
Background technology
In prior art, be applied to the audio amplifier of the slim TV machines such as OLED, ULED, generally adopt loudspeaker unit that is small-bore, short stroke to coordinate the acoustic construction design of opening audio amplifier, improving LF-response characteristic with arranging phase-reversing tube.But this audio amplifier usually there is sound coloration in varying degrees, phase guide tube resonance, wind noise and phase-reversing tube reflect the sound defects such as internal high frequency sound.Although adopt passive radiator can avoid a part of defect, there is again frequency response curve precipitous in the initial segment, the unfavorable characteristics such as transient stability is slightly weak, and cut-off frequency is higher, and total losses Ql value is larger.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of mirror type low frequency radiation device bar shaped audio amplifier is provided, its structure is ingenious, install simple and convenient, have that distortion is little, low frequency good, can bear the acoustic characteristic that power is large and high frequency performance is excellent, the transient stability of audio amplifier can be improved, make audio amplifier can reach good sound effect when radiate low sound.
According to technical scheme provided by the invention: mirror type low frequency radiation device bar shaped audio amplifier, is characterized in that: comprise casing, low frequency radiation device, medium and low spectrum loudspeaker and high pitch loudspeaker; Described casing is flat elongate strip, is respectively equipped with the low frequency radiation device installing hole of positional symmetry in the upper and lower surface of the right half part of casing long axis direction, and two low frequency radiation device correspondences install the interior also specular of lower two low frequency radiation device installing holes; Be provided with medium and low spectrum loudspeaker installing hole in the left-half of casing long axis direction, described medium and low spectrum loudspeaker is arranged in medium and low spectrum loudspeaker installing hole, and the acoustic radiating direction of medium and low spectrum loudspeaker is directly over casing; The left end leading flank of described casing long axis direction is provided with high pitch loudspeaker erecting bed, and described high pitch loudspeaker is arranged on high pitch loudspeaker erecting bed, and the acoustic radiating direction of high pitch loudspeaker is towards casing dead ahead.
As a further improvement on the present invention, described casing comprises fore shell and back cover, and fore shell and back cover are to spelling the complete casing of composition of combining closely; First half low frequency radiation device installing hole is respectively equipped with in the upper and lower surface of fore shell right half part, be respectively equipped with later half low frequency radiation device installing hole in the upper and lower surface of back cover right half part, first half low frequency radiation device installing hole and later half low frequency radiation device installing hole are to spelling the complete low frequency radiation device installing hole of composition; First half medium and low spectrum loudspeaker installing hole is provided with in fore shell left-half, be provided with later half medium and low spectrum loudspeaker installing hole at back cover right half part, first half medium and low spectrum loudspeaker installing hole and later half medium and low spectrum loudspeaker installing hole are to spelling the complete medium and low spectrum loudspeaker installing hole of composition; Described high pitch loudspeaker erecting bed is positioned on fore shell left end leading flank.
As a further improvement on the present invention, two described low frequency radiation device structures are identical, the radiation audio direction being positioned at the low frequency radiation device of casing upper surface, directly over casing, is positioned at the radiation audio direction of the low frequency radiation device of casing lower surface immediately below casing.
As a further improvement on the present invention, the described cavity residing for two low frequency radiation devices communicates with the cavity residing for medium and low spectrum loudspeaker.
As a further improvement on the present invention, described low frequency radiation device adopts the empty sound basin of band ring, the inner edge of described low frequency radiation device installing hole is provided with ring-shaped step, and the edge of described low frequency radiation device is combined closely on described ring-shaped step, the unsettled setting of core of low frequency radiation device.
As a further improvement on the present invention, the ring being positioned at the low frequency radiation device of casing upper surface is heaved directly over casing, and the ring being positioned at the low frequency radiation device of casing lower surface is heaved immediately below casing.
As a further improvement on the present invention, described low frequency radiation device is track type low frequency radiation device.
As a further improvement on the present invention, the longer axis parallel of described track type low frequency radiation device is in the major axis of casing.
As a further improvement on the present invention, the surface of described high pitch loudspeaker erecting bed is provided with erection column, and described high pitch loudspeaker is provided with and erection column installing hole one to one, and described high pitch loudspeaker is fixed on high pitch loudspeaker erecting bed in plug-in mounting mode.
compared with prior art, advantage is in the present invention:
(1) structure of the present invention is ingenious, installs simple and convenient, and two low frequency radiation devices and the distribution of each loud speaker rationally, have that distortion is little, low frequency good, can bear the acoustic characteristic that power is large and high frequency performance is excellent, can improve the transient stability of audio amplifier.
(2) cavity residing for two low frequency radiation devices in the present invention communicates with the cavity residing for medium and low spectrum loudspeaker, when medium and low spectrum loudspeaker energising work, can air push two low frequency radiation devices be driven to do amplitude motion simultaneously, low frequency radiation device and then promotion air, directly over casing, immediately below direct radiate low sound, make audio amplifier can reach good sound effect when radiate low sound.
Accompanying drawing explanation
Fig. 1 is the decomposition chart of the preferred embodiment of the present invention.
Fig. 2 is the profile along long axis direction of the preferred embodiment of the present invention.
Fig. 3 is the outline drawing of the preferred embodiment of the present invention.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
As shown in the figure, mirror type low frequency radiation device bar shaped audio amplifier in embodiment forms primarily of casing, low frequency radiation device 3, medium and low spectrum loudspeaker 4 and high pitch loudspeaker 5, described casing is flat elongate strip, be respectively equipped with the low frequency radiation device installing hole of positional symmetry in the upper and lower surface of the right half part of casing long axis direction, two low frequency radiation device 3 correspondences install the interior also specular of lower two low frequency radiation device installing holes; Be provided with medium and low spectrum loudspeaker installing hole in the left-half of casing long axis direction, described medium and low spectrum loudspeaker 4 is arranged in medium and low spectrum loudspeaker installing hole, and the acoustic radiating direction of medium and low spectrum loudspeaker 4 is directly over casing; The left end leading flank of described casing long axis direction is provided with high pitch loudspeaker erecting bed 2d, and described high pitch loudspeaker 5 is arranged on high pitch loudspeaker erecting bed 2d, and the acoustic radiating direction of high pitch loudspeaker 5 is towards casing dead ahead.
As shown in Fig. 1 ~ Fig. 3, in the embodiment of the present invention, described casing to be combined closely to spelling by fore shell 2 and back cover 1 and is formed, first half low frequency radiation device installing hole 2a is respectively equipped with in the upper and lower surface of fore shell 2 right half part, later half low frequency radiation device installing hole 1a, first half low frequency radiation device installing hole 2a and later half low frequency radiation device installing hole 1a is respectively equipped with to spelling the complete low frequency radiation device installing hole of composition in the upper and lower surface of back cover 1 right half part; First half medium and low spectrum loudspeaker installing hole 2b is provided with in fore shell 2 left-half, be provided with later half medium and low spectrum loudspeaker installing hole 1b at back cover 1 right half part, first half medium and low spectrum loudspeaker installing hole 2b and later half medium and low spectrum loudspeaker installing hole 1b is to spelling the complete medium and low spectrum loudspeaker installing hole of composition; Described high pitch loudspeaker erecting bed 2d is positioned on fore shell 2 left end leading flank.
As shown in Fig. 1 ~ Fig. 3, in the embodiment of the present invention, two described low frequency radiation device 3 structures are identical, and the radiation audio direction being positioned at the low frequency radiation device 3 of casing upper surface, directly over casing, is positioned at the radiation audio direction of the low frequency radiation device 3 of casing lower surface immediately below casing.And described two cavitys residing for low frequency radiation device 3 communicate with the cavity residing for medium and low spectrum loudspeaker 4.Like this when medium and low spectrum loudspeaker 4 is energized work, can air push two low frequency radiation devices 3 be driven to do amplitude motion simultaneously, low frequency radiation device 3 and then promotion air, directly over casing, immediately below direct radiate low sound, make audio amplifier can reach good sound effect when radiate low sound.
As shown in Fig. 1 ~ Fig. 3, in the embodiment of the present invention, described low frequency radiation device 3 adopts the empty sound basin of band ring 3a, and the ring 3a being positioned at the low frequency radiation device 3 of casing upper surface heaves directly over casing, and the ring 3a being positioned at the low frequency radiation device 3 of casing lower surface heaves immediately below casing; The inner edge of described low frequency radiation device installing hole is provided with ring-shaped step, and the edge of described low frequency radiation device 3 is combined closely on described ring-shaped step, the unsettled setting of core of low frequency radiation device 3.
As shown in Fig. 1 ~ Fig. 3, in the embodiment of the present invention, described low frequency radiation device 3 is track type low frequency radiation device 3, and the longer axis parallel of this track type low frequency radiation device 3 is in the major axis of casing.
As shown in Figure 1, in the embodiment of the present invention, the surface of described high pitch loudspeaker erecting bed 2d is provided with erection column 2c, and described high pitch loudspeaker 5 is provided with and erection column 2c installing hole one to one, and described high pitch loudspeaker 5 is fixed on high pitch loudspeaker erecting bed 2d in plug-in mounting mode.
Claims (9)
1. mirror type low frequency radiation device bar shaped audio amplifier, is characterized in that: comprise casing, low frequency radiation device (3), medium and low spectrum loudspeaker (4) and high pitch loudspeaker (5); Described casing is flat elongate strip, is respectively equipped with the low frequency radiation device installing hole of positional symmetry in the upper and lower surface of the right half part of casing long axis direction, and two low frequency radiation device (3) correspondences install the interior also specular of lower two low frequency radiation device installing holes; Be provided with medium and low spectrum loudspeaker installing hole in the left-half of casing long axis direction, described medium and low spectrum loudspeaker (4) is arranged in medium and low spectrum loudspeaker installing hole, and the acoustic radiating direction of medium and low spectrum loudspeaker (4) is directly over casing; The left end leading flank of described casing long axis direction is provided with high pitch loudspeaker erecting bed (2d), and described high pitch loudspeaker (5) is arranged on high pitch loudspeaker erecting bed (2d), and the acoustic radiating direction of high pitch loudspeaker (5) is towards casing dead ahead.
2. mirror type low frequency radiation device bar shaped audio amplifier as claimed in claim 1, is characterized in that: described casing comprises fore shell (2) and back cover (1), and fore shell (2) and back cover (1) are to spelling the complete casing of composition of combining closely; First half low frequency radiation device installing hole (2a) is respectively equipped with in the upper and lower surface of fore shell (2) right half part, be respectively equipped with later half low frequency radiation device installing hole (1a) in the upper and lower surface of back cover (1) right half part, first half low frequency radiation device installing hole (2a) and later half low frequency radiation device installing hole (1a) are to spelling the complete low frequency radiation device installing hole of composition; First half medium and low spectrum loudspeaker installing hole (2b) is provided with in fore shell (2) left-half, be provided with later half medium and low spectrum loudspeaker installing hole (1b) at back cover (1) right half part, first half medium and low spectrum loudspeaker installing hole (2b) and later half medium and low spectrum loudspeaker installing hole (1b) are to spelling the complete medium and low spectrum loudspeaker installing hole of composition; Described high pitch loudspeaker erecting bed (2d) is positioned on fore shell (2) left end leading flank.
3. mirror type low frequency radiation device bar shaped audio amplifier as claimed in claim 1, it is characterized in that: two described low frequency radiation device (3) structures are identical, the radiation audio direction being positioned at the low frequency radiation device (3) of casing upper surface, directly over casing, is positioned at the radiation audio direction of the low frequency radiation device (3) of casing lower surface immediately below casing.
4. mirror type low frequency radiation device bar shaped audio amplifier as claimed in claim 1, is characterized in that: the described cavity residing for two low frequency radiation devices (3) communicates with the cavity residing for medium and low spectrum loudspeaker (4).
5. mirror type low frequency radiation device bar shaped audio amplifier as claimed in claim 1, it is characterized in that: described low frequency radiation device (3) adopts the empty sound basin of band ring (3a), the inner edge of described low frequency radiation device installing hole is provided with ring-shaped step, the edge of described low frequency radiation device (3) is combined closely on described ring-shaped step, the unsettled setting of core of low frequency radiation device (3).
6. mirror type low frequency radiation device bar shaped audio amplifier as claimed in claim 5, it is characterized in that: the ring (3a) being positioned at the low frequency radiation device (3) of casing upper surface is heaved directly over casing, the ring (3a) being positioned at the low frequency radiation device (3) of casing lower surface is heaved immediately below casing.
7. mirror type low frequency radiation device bar shaped audio amplifier as claimed in claim 1, is characterized in that: described low frequency radiation device (3) is track type low frequency radiation device (3).
8. mirror type low frequency radiation device bar shaped audio amplifier as claimed in claim 7, is characterized in that: the longer axis parallel of described track type low frequency radiation device (3) is in the major axis of casing.
9. mirror type low frequency radiation device bar shaped audio amplifier as claimed in claim 1, it is characterized in that: the surface of described high pitch loudspeaker erecting bed (2d) is provided with erection column (2c), described high pitch loudspeaker (5) is provided with and erection column (2c) installing hole one to one, and described high pitch loudspeaker (5) is fixed on high pitch loudspeaker erecting bed (2d) in plug-in mounting mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610120857.6A CN105554597B (en) | 2016-03-03 | 2016-03-03 | Mirror type low frequency radiation device bar speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610120857.6A CN105554597B (en) | 2016-03-03 | 2016-03-03 | Mirror type low frequency radiation device bar speaker |
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| Publication Number | Publication Date |
|---|---|
| CN105554597A true CN105554597A (en) | 2016-05-04 |
| CN105554597B CN105554597B (en) | 2018-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610120857.6A Active CN105554597B (en) | 2016-03-03 | 2016-03-03 | Mirror type low frequency radiation device bar speaker |
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| CN (1) | CN105554597B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109479171A (en) * | 2016-07-11 | 2019-03-15 | 松下知识产权经营株式会社 | Speaker unit |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1906970A (en) * | 2003-07-21 | 2007-01-31 | 伯斯有限公司 | Passive acoustic radiating |
| CN202998378U (en) * | 2012-11-16 | 2013-06-12 | 东莞市金业电子科技有限公司 | Bidirectional passive bass radiator |
| CN104768110A (en) * | 2014-01-06 | 2015-07-08 | 纬创资通股份有限公司 | Speaker module and thin electronic device with same |
| CN104811852A (en) * | 2015-03-04 | 2015-07-29 | 青岛海信电器股份有限公司 | Sound box and television |
| CN105072520A (en) * | 2015-08-18 | 2015-11-18 | 无锡杰夫电声有限公司 | High-fidelity combined loudspeaker box for curved screen |
| CN105142065A (en) * | 2015-08-18 | 2015-12-09 | 无锡杰夫电声有限公司 | Sound box based on oppositely buckled passive radiator |
| CN205071285U (en) * | 2015-10-13 | 2016-03-02 | 无锡杰夫电声股份有限公司 | Polycell thin type audio amplifier that has S -shaped pipe |
-
2016
- 2016-03-03 CN CN201610120857.6A patent/CN105554597B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1906970A (en) * | 2003-07-21 | 2007-01-31 | 伯斯有限公司 | Passive acoustic radiating |
| CN202998378U (en) * | 2012-11-16 | 2013-06-12 | 东莞市金业电子科技有限公司 | Bidirectional passive bass radiator |
| CN104768110A (en) * | 2014-01-06 | 2015-07-08 | 纬创资通股份有限公司 | Speaker module and thin electronic device with same |
| CN104811852A (en) * | 2015-03-04 | 2015-07-29 | 青岛海信电器股份有限公司 | Sound box and television |
| CN105072520A (en) * | 2015-08-18 | 2015-11-18 | 无锡杰夫电声有限公司 | High-fidelity combined loudspeaker box for curved screen |
| CN105142065A (en) * | 2015-08-18 | 2015-12-09 | 无锡杰夫电声有限公司 | Sound box based on oppositely buckled passive radiator |
| CN205071285U (en) * | 2015-10-13 | 2016-03-02 | 无锡杰夫电声股份有限公司 | Polycell thin type audio amplifier that has S -shaped pipe |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109479171A (en) * | 2016-07-11 | 2019-03-15 | 松下知识产权经营株式会社 | Speaker unit |
| JPWO2018012350A1 (en) * | 2016-07-11 | 2019-05-09 | パナソニックＩｐマネジメント株式会社 | Speaker device |
| US10856061B2 (en) | 2016-07-11 | 2020-12-01 | Panasonic Intellectual Property Management Co., Ltd. | Speaker device |
| CN109479171B (en) * | 2016-07-11 | 2021-06-15 | 松下知识产权经营株式会社 | Loudspeaker device |
| CN113115166A (en) * | 2016-07-11 | 2021-07-13 | 松下知识产权经营株式会社 | Loudspeaker device |
| JP2021177656A (en) * | 2016-07-11 | 2021-11-11 | パナソニックＩｐマネジメント株式会社 | Speaker device |
| JP7142198B2 (en) | 2016-07-11 | 2022-09-27 | パナソニックＩｐマネジメント株式会社 | speaker device |
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| Publication number | Publication date |
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| CN105554597B (en) | 2018-09-28 |
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Denomination of invention: Strip-shaped loudspeaker box with mirror image type low-frequency radiators Effective date of registration: 20190705 Granted publication date: 20180928 Pledgee: Agricultural Bank of China, Limited by Share Ltd, Wuxi, Xishan branch Pledgor: WUXI JIEFU ELECTROACOUSTIC CO., LTD. Registration number: 2019990000661 |
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